CDC slot

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The CDC (Communications Daughter Card) slot is an internal expansion slot found in modern ThinkPads.

It is not meant for customer upgrades.
Different CDC slots exist for different functions and different form-factor cards, so you cannot just install any CDC adapter into a CDC slot.

The types of CDC cards you can use in your system is dependent on the BIOS. If you insert a Bluetooth IV with 56K Modem from an R52 system (for instance) and place it into an R51 system which only had the Modem Daughter Card, the system refuses to boot up and displays Invalid Daughter Card.


Cards listed here have a 40pin proprietary connector carrying signals for PCI, AC97 and USB.

Guessed size is 60×40mm and they show those two diagonal opposite screw holes.

List of available Communication Daughter Cards (with 40 pin connector)

see also

Photos (click to see full size)
CDC in a ThinkPad T43-2686
analog modem 56k at cdc

Models featuring this Technology